But even with unicorns there is some basis in reality, because there are horses and there are animals with horns (some not that unlike a unicorn). Regardless, that is a mute point because it was never built. So much for reality...
Again, please educate yourself, yetis are not fake. New species are discovered all the time, that does not make them 'fake' before they are discovered. Yetis are known around the world in various forms i.e. yeti, abominable snowman, sascwatch (sp), and bigfoot. This is likely more than just a coincidence, especially with all of the primates and human/primate hybrids that have existed. And the whole basis of the attraction is to discover the validity of the yeti’s existence, essentially a zoological quest.
And when we are talking the culture of other people as it pertains to animals, comparing it to Avatar in terms of legitimacy is insulting. There is a difference between mythology and sci-fi.
Living or dead Dinosaurs are animals. They are animals, once living, of the earth.
Being loosey goosey with a theme is not using imagination, in fact it is lacking imagination. If you need a popular sci-fi movie to populate a park pertaining to animals of the Earth as defined by not only the initial content as well as the current content and the name of the park itself, with the whole of the earth's animals and related mythology as your topic, then that is lacking imagination. Let's then add a jupiter pavillion to world showcase. After all we are lacking imagination if we don't. Why do all of the pavillions have to be about countries of Earth, and it is a world.
All of animal kingdom takes place on earth. By adding Pandora, we are adding a world not of this earth unlike the rest of the park, and the implication of space travel which obviously has no place in AK.